In Zone Battle, sometimes the announcer says "Target depleted" or "Target repeated" or something along those lines. What does this mean? I know there's a message for "Target attainable," but I've heard her say both messages in one race.

Also, when I start getting those messages, it seems the track is always the black and red color scheme. Is this just the scheme for reaching zone 50-55 in Zone Battle, or does this color scheme indicate that you're in range for the winning zone amount?